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List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [1]
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This is a list of chemical elements and their atomic properties, ordered by Atomic number. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
Element 105 ( Dubnium Db) The Joint Institute for Nuclear Research in Dubna (a Russian city north of Moscow), proposed naming element 105 nielsbohrium ( Ns) after Niels Bohr, while the University of California, Berkeley suggested the name hahnium ( Ha) in honor of Otto Hahn. IUPAC recommended that element 105 be named dubnium, after Dubna.
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1892. Gerhard Krüss. and F. W. Schmidt. Not discovered, but hypothesised to explain discrepancies within the iron group elements for an early periodic table ordered by mass. The concept of atomic number clarified the situation without requiring the invention of a new element. Helvetium. 85. Astatine. 1940.
List of aqueous ions by element. Metallic ions in aqueous solution display many colours: • the red cobalt cation Co2+ from Co (NO 3) 2 (see § Co) • the orange chromium oxyanion Cr2O2− 7 from K 2 Cr 2 O 7 ( § Cr) • the yellow chromium oxyanion CrO2− 4 from K 2 CrO 4 ( § Cr) • the turquoise nickel cation Ni2+ from NiCl 2 ( § Ni)